Apparatus for holding the thread tense in circular-braiding machines



- G. HORN.

APPARATUS FOR HOLDING THE THREAD TENSE IN CIRCULAR BRAIDING MACHINES.-

APPLICATION FILED DEC.29,- I916. 1,343,452. P atentedJune 15, 92

r the spools.

UNITED STATES PATENT OFFICE.

eurno HORN, orv wnrssn vsnn, NEAR BERLIN, GERMANY.

APPARATUS FOR HOLDING THE THREAD TENSE IN CIRCULAR-BRAIDING MACHINES.

' Specification of Letters Patent.

Patented June 15,1920.

Application filed December 29, 1916. Serial No. 139,669..

tion, such as will enable others skilled in the art to which use the same. I

In clrcular braidlng machines in which it appertains to make and the spools are at an invariable distance j the points of braiding, the threads from are, as a rule, held tense by direct braking of the spools. Such brakes are usually in the form of flaps which, under spring pres sure, are forced against the body or runs of The pressure of such springs varies according to their tension and the diameter of the spools, and, consequently, the resistance to the taking off of the thread varies also. If it becomes necessary to revolve backward braiding'machines having such brakes, all the threads will become loose. The object of my invention is to provide an apparatus for use in circular braiding machines of that class in which the bobbins or spools are suspended transversely so that the spindles of the bobbins are at right angles to the axis of the braided fabric, and which will effect a constant braking action so as not only to make up for the variations in tension caused by variations in the diameter of the spools but also, on the machine being revolved backward, maintains the threads tense by taking them back for a sufficient distance. Braiding machines of this character are shown and described in Letters Patent of the United States to Jones, 889,311, granted June 2, 1908, and Beauregard, No. 862,436, granted August 6, 1907. The object of my invention necessitates a construction that requires little space. The thread braking levers known in thread spooling machines, the action of which is increased by guiding the very rapidly moving thread over several guides between two fixed points situated at each end of the lever, cannot be used in the present instance. I provide short levers at an angle to each other which are arranged to revolve together between two fixed points only, for receiving the diameter of the spool is without influence auxiliary thread holds the band 16 engaged by the freeend of lever 27 when thread supply and regulating the thread.

tension. These levers, the revolution of wvhich is limited to What is indispensable,

are separated from the spools which are provided with separate brakes. The alternate action will only occur when the thread is belngconsumed and fresh thread has to be supplled from the spool. The temporary on the thread tension which. only depends on the spring tension of the lever.

eference is to be had to the accompanying drawings in which Figure 1 is a sectional elevation of the preferred form ofmy thread tensioning de- 7 vice. 1

Fig. 2is a plan view thereof, and

Fig. 3 illustrates the operation of the brake,

e the spindle 14 of aspool As illustrated,

- l is held in the carrier 1*.

Fixed on said spindle is a brake disk15 the band of which is indicated at l6. One end of the band is secured to a pin 17*, while its other end is attached to a lever 27 which is pivoted at 28. An adjustable'spring 29 tense.

' Parallel to the spindle 14.- of spool '4 is a shaft 30 which carries'a member 31-. The shaft is so held by'means of an adjustablev spring 33 that the member 31 has atendency to move toward the spool 4- An eccentric groove 32 is formed, in. shaft 30 which is member 31 moves nearer to the spool. The shaft 30 and its member 31 will in future be referred to as the thread spanner.

On the central portion of the spool carrier is fixed a thread guide 34 and a shaft 35. This shaft is recessed as at 36 and rigidly connected to a lever 37 which, together with pin 38, acts as an automatic detector. A spring 39 presses on shaft 35 which spring may be adjusted by a screw 40.

he operation of the apparatus is as follows:

The thread passes from spool 4 below guide 34 and over the thread-spanner 30, 31. From here, it passes below pin 38 ofthe detector through recess 36 of shaft 35 and over spring 39 t0 the braiding point. When, during the delivery of the thread to the braiding mechanism, the thread spanner is moved away from the spool beyond a pre determined degree, the eccentric groove 32 of shaft 30 exerts pressure on lever 27, re-

V or the thread breaksand tension. of the thread ducing the tension of band 16 until more thread is free to be delivered from the spool. This relieves the tension of the thread so that the thread-spanner is free to return to its "initial position under the action of spring I 33, while simultaneously lever 27 is released by the eccentric groove 32 so that the brake band 16 is again put under tension. The play of the thread-spanner is such that the length of thread which becomes released when the machine is revolved backward is held tense. Only when such revolving is continued for a certain length of time the spools must 'also be turned backward to wind up the surplus length of thread.

When the braiding machine is in operation, the heavier upwardly directed end of detector 37 has a tendency to swing to the drawn into the auxiliary thread brake is clearly shown in Fig. 3.

I claim: r 1

1. In a thread tensioning device of the character described, for braiding machines, incombination with the thread spool and its carrier, a thread spanner between said spool and carrier for braking said spool, and a detector over which the thread is guided, operated by the centrifugal power for automatically stopping the machine'upon the stoppage in the feed of the thread, and an auxiliary thread clamp for preventing the ends of the broken thread to be drawn into the braid. V

2. In a thread tensioning device of the character described for braiding machines, in combination with the spool of'the machine and its carrier, a shaft between spool and carrier having an eccentric groove, a hoop member' on said shaft, a lever fulcrumed below said shaft and adapted to be engaged by said groove, a band guided over said spooland secured to said member, a detector operated by centrifugal action for automatically stopping the machine upon stoppage in the thread supply, and an auxiliary clamping device for clamping the loose thread ends and preventing them to be drawn into the braid- 3. In a thread tensioning device of the character described for braiding machines, in combination with the spool of the machine and its carrier, a spring controlledshaft between spool and carrier groove, a hoop member on said shaft, a lever fulcrumed below said-shaft and adapted to be engaged by said groove, a band guided. over said spool and secured to said member, a detector secured to the central portion of having an eccentric the carrier comprising a lever and pin,

adapted to be operated by centrifugal action for automatically 1 stopping the -machine upon stoppage in the thread supply, a spring over which the thread is drawn, meansto adjust said spring, the loose broken ends of the thread and preventing the same to be drawn into the braid. In testimony whereof I hereunto affix my signature in the presence of two witnesses.

, GUIDO HORN. Witnesses:

HENRY HAsPER, ALLEN J. J UNGS.

and means for clamping 

